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#!/usr/bin/lua
-- Filters the given file through markdown, inserts it into the template specified by stdin by
-- replacing simple {{ variable }} tags, and outputs the result to stdout.
-- Filter the file through markdown using TOC generation in order to get header anchors, but
-- ignore the actual TOC.
local p = io.popen('markdown -f toc -T ' .. arg[1])
local html = p:read('*a'):match('^.-\n</ul>\n(.+)$')
html = html:gsub('<h(%d) id="([^"]+)"', function(n, id)
id = id:gsub('%p+', '-'):gsub('%-$', ''):lower():gsub('^l%-', '')
return string.format('<h%d id="%s"', n, id)
end)
p:close()
-- Fill in HTML layout (stdin) with markdown output and print the result.
local tags = {['page.title'] = html:match('<h%d.->([^<]+)'), content = html}
io.write((io.stdin:read('*a'):gsub('{{ (%S+) }}', tags)))
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